I love that you can call your kid "Ocho" (8 in Spanish) as a nickname when they're named Octavio. Of course, there's also the amazing Octavio Paz (poet) to be proud of. But still, I would hope for my child to be born in August before I named him this.
Octavio derives from the number 8. It is commonly given to the 8th son. The eighth month of the year was changed to August (augustus means greater) and by order of the emperor a day equaling itself to the month of July (which also has 31 days) was added. Octavio and Augusto have that possible origin. [translated from Spanish]